Key chain



FIG. 1 is a perspective view of my new design;

FIG. 2 is a front view of the design of FIG. 1;

FIG. 3 is a rear view of my new design;

FIG. 4 is the right side view, with the left side view being a mirror image thereof;

FIG. 5 is the top; and,

FIG. 6 is the bottom view. 

The ornamental design for a key chain, as shown and described. 